dy-lib=libmymath.so 
$(dy-lib):Add.o Sub.o Mul.o Div.o
	gcc -shared -o $@ $^
%.o:%.c
	gcc -fpIC-c $<
.PHONY:output
output:
	mkdir -p mymath_lib/include
	mkdir -p mymath_lib/lib 
	cp *.h mymath_lib/include
	cp *.so mymath_lib/lib 

.PHONY:clean
clean:
	rm -f *.o *.so mymath_lib
